High performance pentacene organic field-effect transistors consisting of biocompatible PMMA/silk fibroin bilayer dielectric  

作　　者：李海强 于军胜 黄伟 施薇 黄江 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information,University of Electronic Science and Technology of China

出　　处：《Chinese Physics B》2014年第3期636-639,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61177032);the Foundation for Innovation Groups of the National Natural Science Foundation of China(Grant No.61021061);the Fundamental Research Funds for the Central Universities,China(Grant No.ZYGX2010Z004);the Scientific Research Staring Foundation for the Returned Overseas Chinese Scholars of the Education Ministry of China(Grant No.GGRYJJ08-05)

摘　　要：Pentacene organic field-effect transistors （OFETs） based on single- or double-layer biocompatible dielectrics of poly（methyl methacrylate） （PMMA） and/or silk fibroin （SF） are fabricated. Compared with those devices based on sin- gle PMMA or SF dielectric or SF/PMMA bilayer dielectric, the OFETs with biocompatible PMMA/SF bilayer dielectric exhibit optimal performance with a high field-effect mobility of 0.21 cm2/Vs and a current on/off ratio of 1.5 × 104. By investigating the surface morphology of the pentacene active layer through atom force microscopy and analyzing the elec- trical properties, the performance enhancement is mainly attributed to the crystallization improvement of the pentacene and the smaller interface trap density at the dielectric/organic interface. Meanwhile, a low contact resistance also indicates that a good electrode/organic contact is formed, thereby assisting the performance improvement of the OFET.Pentacene organic field-effect transistors （OFETs） based on single- or double-layer biocompatible dielectrics of poly（methyl methacrylate） （PMMA） and/or silk fibroin （SF） are fabricated. Compared with those devices based on sin- gle PMMA or SF dielectric or SF/PMMA bilayer dielectric, the OFETs with biocompatible PMMA/SF bilayer dielectric exhibit optimal performance with a high field-effect mobility of 0.21 cm2/Vs and a current on/off ratio of 1.5 × 104. By investigating the surface morphology of the pentacene active layer through atom force microscopy and analyzing the elec- trical properties, the performance enhancement is mainly attributed to the crystallization improvement of the pentacene and the smaller interface trap density at the dielectric/organic interface. Meanwhile, a low contact resistance also indicates that a good electrode/organic contact is formed, thereby assisting the performance improvement of the OFET.

关 键 词：organic filed-effect transistors （OFETs） poly（methyl methacrylate） silk fibroin bilayer dielectric 

分 类 号：O482[理学—固体物理]